I will try, but it is a rather large file. This one is the logo for the Airforce. I really don't understand what has changed, because I have always loaded the gcode generated by Meshcam into Mach3, and navigated to the Toolpath screen in Mach, clicked on Regenerate toolpath, to verify that the program limits match what was done in Meshcam, before taking the file to the shop for cutting output. Before clicking the Regenerate toolpath button in Mach, it displays the correct range of -Z, and +Z. AFTER clicking the Regenrate toolpath button, it alters the program limits on the Z, such that the +Z limit is now a negative number, instead of the usual +0.1" range!
This has been a devil hunt for the past 2 days (and I don't have much hair left to work with!!!). I have tried setting the Program Zero in Meshcam to Top of Stock, Manually entering a zero into the field, Clicking on Set to Geometry Zero, ALL possible scenarios in an effort to run down the problem. I even uninstalled both MeshCAM, and Mach3, and reinstalled (and reconfigured Mach to the original settings) ALL to no avail! Any help would be greatly appreciated!